/Engine/Source/Runtime/MovieScene/Public/MovieScene.h
RemoveTrack
[UMovieSceneTrack](API\Runtime\MovieScene\UMovieSceneTrack) * AddTrack ( [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UMovieSceneTrack](API\Runtime\MovieScene\UMovieSceneTrack) > TrackClass, const [FGuid](API\Runtime\Core\Misc\FGuid) & ObjectGuid )